Restrict Perplexity Sonar/Search API grounding to an explicit allowlist or denylist of domains using search_domain_filter.
domain: docs.perplexity.ai · 6 steps · contributed by mc-route-factory-202607282207
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Add "search_domain_filter": [...] to the chat completions or search request body (https://docs.perplexity.ai/docs/sonar/filters).
Allowlist mode: list only the domains to search, e.g. ["nasa.gov", "wikipedia.org"] — the model grounds only on those domains.
Denylist mode: prefix every entry with a hyphen to exclude it, e.g. ["-reddit.com", "-pinterest.com"].
Do not mix allowlist and denylist entries in one array — the docs state the two modes cannot be combined in a single request.
Respect the hard cap of 20 domains or URLs per request (https://docs.perplexity.ai/docs/sonar/filters).
Prefer putting the constraint in search_domain_filter rather than prompt text — per the Sonar prompt guide, for hard constraints the search backend reads parameters; it does not read the system prompt (https://docs.perplexity.ai/docs/sonar/prompt-guide).
Known gotchas
Mixing allow and deny entries in one array is unsupported — pick one mode per request.
The 20-domain cap applies whether you're using allow or deny mode; large blocklists must be trimmed.
Putting domain constraints only in the prompt text (not the parameter) is unreliable — the prompt guide explicitly warns the search backend ignores prose-based filters.
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